Hydraulic air compressor



e. T. UNDERWOOD. HYDRAULIC AIR COMPRESSOR. APPLICATION FILED MAR. 5- I921.

Patented Aug. 15, 1 922..

4 a? mm IN VENTOR.

. the amount of air pressure desired.

srars GEORGE '1. UNDERWOOD, OF MAXWELL, CALIFORNIA.

HYDRAULIC AIR coiarnnsson,

1 0 all whom it may concern.

Be it known that l, Gnonen T. UNDER- wooo, of Maxwell, in the county of Colusa and State of California, have invented a Hydraulic Air Compressor, of which the following is a specification.

This invention has for its object to compress air for general purposes, such as where compressed air is used in mines, liquid air plants, or ice. plants,and may be installed in mountainous districts high water pressure can be obtained, and is advanta eous over the ordinary air pump in the fact that few wearing parts are required, and little attention is required to operate.

The accompanying drawing, forming a part of this specification, represents a. sectional view of the entire apparatus embodying my invention.-

In the drawing, A represents any suitable reservoir oi mountain stream, the elevation from the lower apparatus depending upon Pipe B carries said water together with its pressure, to chamber J, and said water in filling chamber J, crowds the air from chamber J,

through check valve L, )ipe M, into air.

tank N. Said water rises to line B indicated by gauge glass S, and the weight of the water in chamber J is then sufiicient to lower chamber J, and raise balance weight 0 from point U to point T. Valve D then closes by the aid of pedestal G, stopping water from flowing through pipe B, and valve E opens by striking pedestal F, and the water passes from chamber J into tank V. The water in tankV acts as a balance weight to hold chamber J down until empty. As the water passes from chamber J a fresh charge of air enters chamber J through check valve K. WVhen a suflicient quantity of water passes from tank V through opening W to lessen the weight of where Specification of Letters Patent. Patented Aug; 15, 1922.

Application filed March 5, 1921. i i

Serial No. 449,640.

the apparatus sufliciently, balance weight 0- drops from point T to point U. Chamber J and tank V rises and closes valve E and opens valve D, andchamber J again refills with water and the said operation continues to automatically repeat, until the air pressure in tank N is equal to the waterpressure in pipe B ,when the apparatus will.

automatically stopuntil air is taken from tank N, when the said apparatus will automatically start itself and the said operation continue to repeat until the air pressure in tank N again equals the pressure in pipe B Pipes M and B are of such length that the natural spring of the pipes permits chamber J to raise and lower sufhciently without damaging the pipes. 1

The angle of balance bar X may be, adjusted by means of adjust-able brace bar P.

Weight 0 may be adjusted in or out on baltherewith when the second mentioned valve is open having a smaller outlet whereby rises from saidtank serves to hold down said first named tank. until same is emptied, substan-.

tially as described.

' GEORGE T. UNDERVVOOD. lVitnesses: v I

I LAWRENCE PRINE, D. F. Perm. 

